frm_csv_where

Use this code to export only those entries that were created in January 2015. This example applies to a particular form. Change 129 to the ID of your form (in two places).

add_filter('frm_csv_where', 'limit_csv_by_date', 10, 2);
function limit_csv_by_date($where, $args){
	if ( $args['form_id'] == 19 ) {// Change 19 to the ID of your form
		$where['form_id'] = 19;// Change 19 to the ID of your form
		$where['created_at >'] = '2015-01-01 00:00:00';
		$where['created_at <'] = '2015-01-31 23:59:59';
	}
	return $where;
}

Use this code to export the entries created by the current user. The user must have permission to "View Entries from the Admin area" in order for this to work.

add_filter('frm_csv_where', 'limit_csv_to_current_user', 10, 2);
function limit_csv_to_current_user($where, $args){
	if ( $args['form_id'] == 19 ) {// Change 19 to the ID of your form
		$current_user = wp_get_current_user();
		$where['form_id'] = 19;// Change 19 to the ID of your form again
		$where['user_id'] =  $current_user->ID;
	}
	return $where;
}

Use the code below to filter a CSV so it only includes entries where a Dynamic field has an entry selected that was created by the current user. Replace 1003 with the ID of your form, replace 19 with the ID of the form that the Dynamic field gets its value from, and replace 12666 with the ID of the Dynamic field.

add_filter('frm_csv_where', 'filter_by_linked_id', 10, 2);
function filter_by_linked_id( $where, $args ) {
	if ( $args['form_id'] == 1003 ) {// Change 19 to the ID of your form
		$user_id = get_current_user_id();
		$linked_form_id = 19;
		$linked_id_where = array( 'user_id' => $user_id, 'form_id' => $linked_form_id );
		$linked_ids = FrmDb::get_col( 'frm_items', $linked_id_where, 'id' );

		if ( is_array( $linked_ids ) ) {
			global $wpdb;
			$dynamic_field_id = 12666;
			$query = 'SELECT e.id FROM ' . $wpdb->prefix . 'frm_items e';
			$query .= ' INNER JOIN ' . $wpdb->prefix . 'frm_item_metas m ON e.id=m.item_id';
			$query .= ' WHERE m.field_id=' . $dynamic_field_id;
			$query .= ' AND m.meta_value IN (' . implode( ',', $linked_ids ) . ')';

			$entry_ids = $wpdb->get_col( $query );
		} else {
			$entry_ids = false;
		}

		if ( is_array( $entry_ids ) ) {
			$where['id'] = $entry_ids;
		} else if ( ! $entry_ids ) {
			$where['id'] = 0;
		}
	}
	return $where;
}